{"cve":"CVE-2026-39320","nvd":{"published":"2026-04-21T01:16:05.063","modified":"2026-10-26T22:10:00.163","status":"Analyzed","description":"Signal K Server is a server application that runs on a central hub in a boat. Versions prior to 2.25.0 are vulnerable to an unauthenticated Regular Expression Denial of Service (ReDoS) attack within the WebSocket subscription handling logic. By injecting unescaped regex metacharacters into the `context` parameter of a stream subscription, an attacker can force the server's Node.js event loop into a catastrophic backtracking loop when evaluating long string identifiers (like the server's self UUID). This results in a total Denial of Service (DoS) where the server CPU spikes to 100% and becomes completely unresponsive to further API or socket requests. Version 2.25.0 contains a fix.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-1333"],"references":["https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","https://github.com/SignalK/signalk-server/pull/2568","https://github.com/SignalK/signalk-server/releases/tag/v2.25.0","https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884","https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884"],"products":["signalk:signal_k_server"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-39320","score":0.00427,"percentile":0.36737,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-7gcj-phff-2884","url":"https://osv.dev/vulnerability/GHSA-7gcj-phff-2884","summary":"Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths","modified":"2026-04-21T17:41:28.938991Z","packages":[{"ecosystem":"npm","name":"signalk-server","purl":"pkg:npm/signalk-server","ranges":["<2.25.0"],"fixed":["2.25.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}